Device to resist the disarming of bombs



4, 1953 J. RABINOW 2,647,465

DEVICE TO RESIST THE DISARMING OF BOMBS Filed June 3, 1952 INVEN TOR.

rlncu'h Rubinuw BY V' M Jr 6i hat/QM Patented Aug. 4, 1953 STATES H 2,647,465 DEVICE TO RESIST THE DISARMING F BOMBS Jacob Rabinow, Takoma Park, Md., assignor to the United States of America as represented by the Secretary of the Army Application June 3, 1952, Serial No. 291,588

3 Claims. (01. 102-70) H (Granted under Title 35, U. S. Code (1952),

sec. 266) The invention described herein may be manufactured and used by the Government for governmental purposes without the payment to me of any royalty thereon.

This invention relates to bomb fuses and more particularly to means for preventing the successful disarming of bombs and bomb fuses or the like.

Where bombs which have been dropped on enemy targets fail to detonate, extensive efforts are generally made by enemy personnel to disarm the bombs without causing detonation. One of the more common means of disarming a bomb is to drill a small hole into the fuse cavity and pour therein a disabling liquid which may be an acid or a material which will solidify around the moving elements. In order to make disarming by drilling impossible,.I have devised a means wherein variations in pressure between chambers in the fuse will cause detonation of the bomb; My device may be used in under water as well as in surface missiles.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from the following description and accompanying drawings in which:

Figure 1 is a longitudinal sectional view showillgan embodiment of the invention incorporated in a point detonating fuse affixed to a general purpose bomb.

Figure 2 is a cross sectional view taken generally along lines 22 of Figure 1.

Figure 3 is an enlarged cross sectional view of a pressure equalizing means.

Figure 4 is a schematic wiring diagram of the invention.

eierring now to Figure 1 of the drawings wherein i indicates a bomb casing having an explosive charge 2 therein and 3 indicates a point detonating type of fuse threadedly afixed in the nose A of the bomb. A cavity 5 is formed in the body of the fuse which in combination with a base plate 5 forms a hermetically sealed chamber H. The base plate is sealed to the body as by soldering to a shoulder 1 formed in the longitudinal walls 8 of the cavity 5 adjacent the open end 9. A booster i3 is conventionally assembled to the fuse at the open end 9. Chamber I2 is formed within the chamber II by means of a cylindrical member I3 in sealed, threaded engagement wtih a recess M formed in the wall 8 as indicated by reference numeral [5. The end of cylindrical member I3 is provided with diaphragm [6. The diaphragm I6 is coupled to blade 11 of a single pole double throw switch 2|.

Q The blade being positioned between oppositely disposed contacts l9 and supported and connected by means of a U-shaped member Zla which is aflixed to wall 8 in insulated relation.- ship thereto. A pressure equalizing means 23 is formed integral with the cylindrical member l3 and consists of an orifice 22 extending through the wall of. the cylindrical member and surrounded on the outside surface of the wall by means of a nipple 23a formed therewith. The nipple houses a ceramic plate 24, which is held therein by means of a cap member 25 in threaded engagement with the nipple. An orifice 26 in the cap member is in alignment with the orifice 22. Member 24a is a gasket surrounding the edge of the ceramic 243. A valve Zlfor admitting air to chamber I 2 is afiixed in that portion of wall 8 which forms one closed end of the cylindrical member 13. A valve 28is also affixed in the wall 8 for admitting air to chamber I I. The nose member 3 has formed therein a longitudinal bore 29. Coextensive with bore 29 is a tubular member- 30. The forward end of member 3!! is sealed in the nose member 3 as at 3| in any conventional manner and the oppositeend 32, containinga detonator 33, is sealed in a perforation 34 in plate 6 in any conventional manner, for example, as by soldering at 35. A striker 36 positioned in bore 29 and tube is releasably maintained therein in alignment with detonator 33 by means of shear pin 31. An electric detonator 38 is sealed in a perforation 33 in plate 6 by means of any of the well known sealing compounds. A trembler switch 46 positioned in a recess 46a and an inertia switch 40 is positioned in recess M of the nose member 3, both extending interiorly of the chamber H. A battery in the chamber H may be held therein by its opposite ends in recesses 42 and 43 formed in the interior surfaces of the nose 3 and plate 6, respectively.

Figure 4 is a wiring diagram showing the battery 45, inertia switch 40, detonator 38 and switch 2| in series connection with the trembler switch 46 shunted across switch 2|.

Before the fuse is assembled to the explosive missile, chambers H and I2 are either equally pressurized or partially evacuated. Under either condition the blade I! is out of contact with the contacts I9 and 20. If the striker fails to function the detonator 33 or any other means designed for normal functioning of a fuse fails to cause detonation of the bomb, such as timing means incorporated in certain fuses, any attempt to disarm the bomb by the aforementioned drilling method will cause loss of pressure in either the chamber H or I2. Assuming that the drill enters chamber II, the air pressure will be reduced therein due to air escaping through the drilled hole will, result, in diaphragm Hi moving the blade I! into contact with contact l9v thereby closing the circuit and functioning the detonator 38. phragm will move inwardly of the chamber and cause blade I! to close the circuit through enrgagement with the contact 20. v

The inertia switch 40 is operative, upon inpact of the bomb and target to cqnnectthe, battery in the circuit. The trembler switch 46 is included in the embodiment as an anti-disturbance means which will close the circuit and cause detonation if any attempt is made to remove the bomb.

Figure 3 is an enlarged cross sectional View of the pressure equalizing means. member 24 Will allow air to leak therethroug-h, either from. the chamber l2 or the chamber II and thereby maintained equal air pressure in the chambers. The orifices 25. and 22 in the cap and wall, respectively, admit air to the ceramic element 24;.

t will be apparent that the embodimentv shown is only exemplary and that various modifications can be made in construction and arrangement within the scope of the invention as defined in the appended claims.

I claim:

1, Means, to resist disarming of a bomb of the character described comprising a hermetically sealed container within the bomb, a second hermetically sealed container within the first'mentioned container, each of said containers being equally pressurized, pressure equalizing means incorporated in said second container for malntaining equal pressure in each container, a double acting switch mounted on the interior surface of the first mentioned container, a diaphragm comprising one wall of the second container, the moving element of the switch operativelyconnected to the diaphragm, the dia-. ph-ragm causing said switch to close an electric circuit containing a detonator when there is a If the drill should enter chamber l2 the diae v The ceramic 4 substantial difi'erence in pressure in either container.

2. The invention in accordance with claim 1 wh r in a d pr equalizing means comprises a ceramic plate hermetically sealed in a wall of the second container, one face of the plate ,being exposed to the interior of second container,

an interior wall of the chamber, the chamber and container being equally pressurized, breather means integral with the container to normally maintain pressure equilibrium in the chamber and cuntainer, a diaphragm comprising an end member of the container, a double acting switch mounted on said wall, the moving element of said switch linked to the diaphragm, a detonator affixed in the base of the chamber, and power supply means, said switch detonator and power supply means forming a detonator firing circuit, an antiadisturbance means in shunt with said switch, Said diaphragm operative in response to a pressure, difierential of magnitude greater than normal to close the switch and cause the detoeater to. function.

JACOB RABINOW.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 5313,52 1 Leon Feb. 23, 1909 FOREIGN PATENTS Number Country Date 522,990 Great Britain July 2, 1940 

